Ditto. I went through 6 rounds of chemo, two surgeries (so far) and am happily an atheist. At first I wasn't sure how to handle the helpful people who wanted to know if I had been saved (because that's what you ask a co-worker who has just been diagnosed with cancer..) Some people want to pray for me... I let them, although the risk is that I recover, and they take credit... rather than my wonderful oncologist and treatment team.
Yes, there are atheists and agnostics in chemo rooms, we just don't advertise, don't preach, and graciously accept your prayers... even though we don't think they are helpful...
I lose myself at the movies... Watching Netflix and seeing a movie I loved, transports me to a time before cancer. A new movie that sweeps me off my feet... I love being someone else for a couple hours. A good book will do the same thing (but sometimes I need the sensory overload of a movie.)
I also meet new people, play with new ideas. Frequently I don't mention my cancer in those settings. At this point, my hair is growing back, so I am passing as a healthy person. This disease isn't who I am.